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中文摘要：
补偿电容失效是无绝缘轨道电路中的常见故障,严重影响列车的正常运行和铁路的运输效率。本文基于轨道电路分路状态模型,分析补偿电容不同故障情形对分路电流的影响规律,在此基础上利用相空间重构技术,对一维分路电流包络信号序列进行重构操作,获取反映系统状态特性的伪相图,从中提取补偿电容的故障特征,从而实现补偿电容故障的检测。实验结果表明：该方法不仅能准确检测补偿电容断线和被击穿等严重故障,对连接松动和容值下降等性能不佳的情形也有很好的检测效果,且实现简单、时效性强,符合铁路部门提出的预防性维修理念。
英文摘要：
Failure of compensation capacitors is the common fault of jointless track circuits and this has an adverse effect on normal operation of trains and transport efficiency of railways.In this paper the model of the shunt state of jointless track circuits was established,and it was used to analyze the law of impacts caused by different kinds of faults of compensation capacitors to the one dimensional signal named shunt current envelope.The signal was reconstructed by the theory of phase space reconstruction,and the result was expressed by the pseudo-phase portrait which contained the features of fault compensation capacitors,then the final decision was made for detection of a fault in the system.Experiments with simulated and measured data show that this method can not only detect the serious faults such as disconnection and breakdown but also is effective for the situation of loose connection and capacitance degradation,furthermore this method is simple,time-sensitive and can comply with the requirements of preventive maintenance.
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